Question

Two cars are travelling on horizontal roads in straight lines, car A at 70 km/h at N 10° E and car B at 50 km/h at W 60° N. Determine, by drawing a vector diagram to scale, the velocity of car A relative to car B.

Answer 1

First, we project the velocity of A (black) on the line of velocity of B (blue). Then we add the projection of A to B and get the red vector, that is, velocity of A measured by B: it moves away at approximately 10 km/h